Book of Kings Slot by Playtech

Three books landing anywhere award 10 free games, and how that round plays out is settled before the first spin turns. One ordinary symbol gets picked at random to be the special expanding symbol, could be the Pharaoh, could be a card royal, anything but a book itself. For the rest of the round, every time that chosen symbol lands it stretches to cover its whole reel and pays from any position, no payline needed. Draw a premium and a single spin can blanket three reels at once. It retriggers too, so the right pick just keeps building.

The twist is a second book. Alongside the plain golden Book sits one coiled by a snake, and it does the same wild-and-scatter job with a bonus attached: when the snake books are what trigger the round, every line and scatter win across those 10 spins is tripled. The two never share a bonus, so you're either playing a standard set of free games or a 3x version of it, and which book turned up to start things decides that.

Both books work as wilds in the base game, each covering everything except the other, and both pay as scatters on their own. Nothing else is stacked on top. No jackpot, no ante, no buy button, three books the slow way is the only route in. The dressing is straight Egyptian treasure hunt: a lantern-carrying explorer over a golden run of pyramids and palms at sunset, reels set on cracked-parchment panels inside a red-and-gold temple border. The icons are gilded and gem-studded, a jewelled Tutankhamun mask at the top, a golden Horus falcon, the blue Eye of Horus, and glossy royals filling the rest. Anyone who's played Book of Dead knows the rhythm already; this one just adds the snake and its triple.